diff --git a/readline/ChangeLog b/readline/ChangeLog
index 25f6a190f1..467410ee95 100644
--- a/readline/ChangeLog
+++ b/readline/ChangeLog
@@ -1,3 +1,7 @@
+Tue Nov 19 15:02:13 1991  Stu Grossman  (grossman at cygnus.com)
+
+	* history.c:  #include "sysdep.h".
+
 Tue Nov 19 10:49:17 1991  Fred Fish  (fnf at cygnus.com)
 
 	* Makefile.in, config/hm-sysv, config/hm-sco:  Change SYSV to
diff --git a/readline/history.c b/readline/history.c
index 9f0a41ec5a..7946453bff 100644
--- a/readline/history.c
+++ b/readline/history.c
@@ -31,6 +31,7 @@ extern char *xmalloc (), *xrealloc ();
 static char *xmalloc (), *xrealloc ();
 #endif
 
+#include "sysdep.h"
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/file.h>
@@ -42,8 +43,6 @@ static char *xmalloc (), *xrealloc ();
 #else
 #  if defined (sparc) || defined (HAVE_ALLOCA_H)
 #    include <alloca.h>
-#  else
-extern char *alloca ();
 #  endif /* sparc || HAVE_ALLOCA_H */
 #endif /* !__GNU_C__ */